public class Text4 {
    public static void main(String[] args) {
    int [] arr = {1,2,3,4,5,6};
        int [] newArr = copyOFRange(arr,1,4);
        for (int i = 0; i < newArr.length; i++) {
            System.out.print(newArr[i] + " ");
        }
    }
    public static int[] copyOFRange(int[] arr,int from,int to){
        //动态初始化，不知道具体数据，知道个数
        int [] arrCopy = new int[to - from];
        int index = 0;
        for(int i = from;i < to;i++){
            arrCopy[index] = arr[i];
            index++;
        }
        return arrCopy;

    }
}
